A catfish is someone who assumes a false identity on the Internet using various platforms including but not limited to Facebook, Twitter, and Instagram. A catfish is often undesirable in comparison to thier profile, as an actual catfish would be to a premium "catch" fish like Alaskan salmon.

I met this guy on match.com who was a total catfish. His pic was cute but he obviously thinks he is a time traveler cause he looked like Matlock!

A Catfish is someone who pretends to be someone else then themselves on Social Media (Instagram, Facebook, ect.). They all have different purposes. From trying to get people to like them, to just being a stalker. Not to be confused with roleplaying. (Roleplaying is pretending to be someone else but the people know that you are. Ex: If there is a instagram that is roleplaying it will say it in the bio.) Using a cartoon character is completely different, those accounts you will know straight away its a fan account or a roleplaying one.

Brooke is such a Catfish, she tricked David into liking the Catfish version of herself.